Creative Sound Blaster Live! is the minimum soundcard I recommend for most distros - they are very cheap these days. The Audigy cards are also starting to come down in price. I know other cards work but I've never had any hassles (except when I've broken it ) with Creative sound cards.

im using on board sound ac97 and i use teamspeak and ut2004 now i know going by this that teamspeak uses the only play back device so no sound in any games while teamspeak is on i have tryed many times to follow that tutorial but no joy every time so if i keep my on board sound for teamspeak is it possible to use my soundblaster for games (in afect have two play back devices)